 <template>
  <view>
  <view class="search-box">
    <!-- 基本用法 -->
    <uni-search-bar placeholder="请输入你想要搜索的内容" @input="input" :radius="100" cancelButton="none"></uni-search-bar>
    
  </view>
  <!-- 搜索建议列表 -->
  <view class="sugg-list" v-if="searchResults.length !==0">
    <view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
      <view class="goods-name">{{item.goods_name}}</view>
      <uni-icons type="arrowright" size="16"></uni-icons>
    </view>
    
  </view>
  <!-- 搜索历史 -->
  <view class="history-box" v-else>
    <!-- 标题区域 -->
    <view class="history-title">
      <text>搜索历史</text>
      <uni-icons type="trash" size="18" @click="clean"></uni-icons>
    </view>
    <!-- 列表区域 -->
    <view class="hostory-list">
     <uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotogoodsLlist(item)"></uni-tag>
    </view>
  </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer:null,
        kw:'',
        // 搜索的结果列表
          searchResults:[],
          // 搜索历史的数组
          historyList:[]
      };
    },
    onLoad(){
     // this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
     this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods:{
      // input输入事件的处理函数
      input(e){
        // 清除掉延时器
        clearTimeout(this.timer)
        // console.log(e.valueOf())
        // 添加延时 防止防抖 避免用户输入一次就请求一次
        this.timer = setTimeout(() =>{
          // console.log(e.valueOf())
          this.kw = e.valueOf()
          this.getSearchList()
        },500)
      },
     async getSearchList(){
        // 判断搜索关键词是否为空
        if(this.kw.length === 0){
          this.searchResults = []
          return
        }
      const {data:res}= await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
      if(res.meta.status !== 200) return uni.$showMsg()
      this.searchResults = res.message
      
      this.saveSearchHistory()
      },
      gotoDetail(item){
        // console.log(item.goods_id)
        uni.navigateTo({
          url:'/subpkg/goodsdetail/goodsdetail?goods_id + item.goods_id'
        })
      },
      // 保存搜索关键字
      saveSearchHistory(){
        // this.historyList.push(this.kw)
        const set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        // console.log(set)
        this.historyList = Array.from(set)
        
        // 对搜索历史数据,进行持久化的存储
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      clean(){
        this.historyList = []
        uni.setStorageSync('kw','[]')
      },
      gotogoodsLlist(kw){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query=' + kw
        })
      }
    },
    computed:{
      histories(){
        return [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
.search-box{
  position: sticky;
  top: 0;
  z-index: 999;
}
.sugg-list{
  padding: 0 5px;
  
  .sugg-item{
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    .goods-name{
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
  }
}
.history-box{
  padding: 0 5px;
  .history-title{
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 40px;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }
  .hostory-list{
    display: flex;
    .uni-tag{
      margin: 0 5px;
    }
  }
}
</style>
